package com.xstech.library.app;

import android.app.Activity;
import android.content.Context;

import java.util.NoSuchElementException;
import java.util.Stack;


public class AppManager {
    private static Stack<Activity> activityStack;
    private static AppManager instance;

    private AppManager() {
    }

    /**
     * 单一实例
     */
    public static AppManager getAppManager() {
        if (instance == null) {
            instance = new AppManager();
        }
        return instance;
    }

    /**
     * 添加Activity到堆栈
     */
    public void addActivity(Activity activity) {
        if (activityStack == null) {
            activityStack = new Stack<Activity>();
        }
        activityStack.add(activity);
    }

    public int getActivityStackSize() {
        if (activityStack != null) {
            return activityStack.size();
        }
        return 0;
    }

    /**
     * 获取当前Activity（堆栈中最后一个压入的）
     */
    public Activity currentActivity() {
        try {
            Activity activity = activityStack.lastElement();
            return activity;
        } catch (NoSuchElementException e) {
            return null;
        }
    }

    /**
     * 结束当前Activity（堆栈中最后一个压入的）
     */
    public void finishActivity() {
        Activity activity = activityStack.lastElement();
        finishActivity(activity);
    }

    /**
     * 结束指定的Activity
     */
    public void finishActivity(Activity activity) {
        if (activity != null) {
            if (!activity.isFinishing())
                activity.finish();
            activityStack.remove(activity);
            activity = null;
        }

    }

    /**
     * 结束指定类名的Activity
     */
    public void finishActivity(Class<?> cls) {
        Activity activity1 = null;
        for (Activity activity : activityStack) {
            if (activity.getClass().equals(cls)) {
                activity1 = activity;
                if (!activity.isFinishing()) {
                    activity.finish();
                }
            }
        }
        if (activity1 != null) {
            activityStack.remove(activity1);
        }
    }

    //获取指定类名的Activity
    public Activity getActivity(Class<?> cls) {
        for (Activity activity : activityStack) {
            if (activity.getClass().equals(cls)) {
                return activity;
            }
        }
        return null;
    }

    /**
     * 结束所有Activity
     */
    public void finishAllActivity() {
        for (int i = 0, size = activityStack.size(); i < size; i++) {
            if (null != activityStack.get(i)) {
                activityStack.get(i).finish();
            }
        }
        activityStack.clear();
    }

    /**
     * 退出应用程序
     */
    public void AppExit() {
        try {
            finishAllActivity();
            System.exit(0);
        } catch (Exception e) {
        }
    }

    /**
     * 结束除cls之外所有的activity，执行结果清空stack
     */
    public void finishAllActivityExceptOne(Class<? extends Activity> cls) {
        while (!activityStack.empty()) {
            Activity activity = currentActivity();
            if (activity.getClass().equals(cls)) {
                popActivity(activity);
            } else {
                finishActivity(activity);
            }
        }

    }

    public void popActivity(Activity activity) {
        if (activity != null) activityStack.remove(activity);
    }

}